The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2015
Filed:
Dec. 13, 2012
Rhodia Operations, Paris, FR;
RHODIA OPERATIONS, Paris, FR;
Abstract
A method is described for purifying vanillin, and derivatives thereof, from an initial solution of vanillin or of a vanillin derivative in a solvent S1 containing impurities, comprising the following steps: a) a step of evaporating the solvent S1 in the presence of water from such initial solution to obtain an aqueous solution of vanillin or of a vanillin derivative; b) a step of liquid/liquid extraction by bringing the aqueous solution obtained at the end of step a) into contact with a solvent S2, at a pH of greater than 8 and less than 10, to obtain an organic phase and an aqueous phase containing vanillin or a vanillin derivative and residual solvent S2; c) a step of precipitating, at a pH between 4 and 7.5, the vanillin contained in the aqueous phase obtained at the end of step b); and d) a step of isolating the vanillin or derivative thereof.